Sudden crash of FPS 200-30.

I would like someone to help me. because this very frustrating plays Dirty bomb after half an hour of game, I spent all week trying to solve the problem thinking it was my video card.
but I realized that this lag only happens in Dirty Bomb. because I tested in other BF4, GTA5 and others I had no problem.
I would like to know if there is any configuration in the game that you do not know? for improvement or lag.
Thank you very much in advance.